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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06fc436ab6525027978b635b184efc989be6cfbf4509b9fe1a3eeb0b13b816cc' 
  AND token = 'bsoVoDDCqpojXy3U1G2tXCx8Bdly3SxdyJjejD7ETdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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