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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa2425f9e0039790e7975e06f66d665012249d8a33fd8d5a573419b8c07550c7' 
  AND token = 'Cis+mU+9m9qvZ5IqoR6yXviempypgAPE1Y0XkBN02aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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