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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64aba92b218f98f90ee1f11afa5a8ae91da0f249a7622a08bd79b550fb0495e8' 
  AND token = '3WKr4Evxa+n3VRXlA8NPKkWrv+4O2nSeKSnRXTuLwNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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