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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e88450b824993fe3d696ded081dcdffddb39ae61f3712d36772159f628538f25' 
  AND token = 'vINn1MV/pkEpMzIM84G9SBvdzaMLlFV3AIdqt6ffmO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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