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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a8fc75269bed25b66f73cac3546e72cc8c7a80f47a05c1354df4990f932ed2f' 
  AND token = 'wEetNr6TC7UR1FBQ/+wVEu3Zs6i4lYI1upVDdsMuIwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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