SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8e47d9ecf3ee54693ba9fad46f131295b55645b81430891eec11e6c625417d6' 
  AND token = '8dB/pdeaV8PKyiZEu7I/dRGUjgQE+BwfznoK7l3sBiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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