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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17feea25ca4ad2a0340d6a26a408a006dd52f212f8be1813f71eacc6fd5d5528' 
  AND token = 'ZRk6VKRWWC4R2sDgzKlJZkuxk+PdUktf4pFHW/+angs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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