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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18f5510e5b89ffac0a6507647b985620d0df0ddc8b8ed41138673eb95468df79' 
  AND token = 'sa42a7CAzTeypM5M7LcUyWucMRAr3eDk0zaWh1LIoQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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