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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7c4428715cb4c37ebfc5740dcffda167969c2fd6f9c8b8c706237041d44a911' 
  AND token = 'zpx1YmDf6aCsyJTd0DQtLp31gefRm1DVjySAJbFmoI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}