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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6cf27b5af35f5f494b058705843e23e29317ee7f3f88c534a12a6e48b82c898' 
  AND token = 'Ux3TJBnmQC9jnrI/+HXZgJnURXyE35Cib1CQ0sEerT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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