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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd913a1c2658c223f7adb32cb874bbf5ec391be83bc2f3a15a2fdcd403b0e5668' 
  AND token = 'Iv4HPC88dEyBN5hnB07u4aE6ls2RUDKpkzPB7yUoObs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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