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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ef3b0cd46cb667f6c17c9782e43a40de9c1054f1340c87774352b6cce7c79d8' 
  AND token = '35/ipExbjJUEmpzHAFdJ4Kfmr0Udnrn6DnpvV4V23MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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