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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5d06ee8ef788e46d13f6c1ed803889666484faadeb972f0f1a562eb5e598f3f' 
  AND token = 'epErPHDKDOiy6ViepTRzamDDj/SVEzhSDIMADbT3VLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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