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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66c1697f586494f9437c9ae6cc2e61a250aedcc05914489349a35018f53e1d46' 
  AND token = 'tbJp7yAP4tD+fETTq59t14SYc6pqcdf68XXB5XsOsRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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