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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2479dabe2fce5de307c405683b1b321b635969719a1ceaa41030b78fd2b3b881' 
  AND token = '2n4v2CUzuL4gMWBkIsrw2ECJl+hDNSHF9lAru2o2yHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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