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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd817452ed500caf16e40bbbe4be5d81d5e15b869637bb65f15fc084f6d863b2c' 
  AND token = 'ImbeJYhxletoU5EuVT1T5Gt7nO0OX5UaYjxq/3fDe9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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