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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d6e4fb0195ff7acd235954cc3b5803e32c73e9b5cd571de60b802bc13ae37ff' 
  AND token = 'vCMWox3UsQGQac4ispmtd7bk/lRBur/DQ3CUBqkMeK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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