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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aac19e43ce8d1dd45fd211480eaad76eb45fbcc14fdbcef0737164b746c7795f' 
  AND token = 'P0bvTGosS87qYoAdm1PS1E2pJtqy57NBL2YYZo2Rd4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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