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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd99d5f9a384a8291fd36ce599066304e766fd2c9c7c0c843a3456e5cecc5630e' 
  AND token = 'v8XwhQLqYQk4pP71MVN9YC5m/Mn3Gm1pn3Oc5rlAT/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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