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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25d27097a44f6a7c9c3db8ac1b93c0884c2c95ddc536abe33536b48b7c3dba09' 
  AND token = 'Qvcq8otbCCx3yeFR//TfkBiqMF9X06FuBCpdFf7D7wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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