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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a508106149af5bc7e88834b819aa80b523f152ec664d4bb4e4b1782d80e8cb82' 
  AND token = 'OQVAO66813aolKNH9pwsnr9UljBWHA10ExB/kbiPY3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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