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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19d14f5952cf631c9c5a51eebc7ad97ef404b7846a9431cde5b9cdc630bdd3de' 
  AND token = 'fdQeLkz5+ss96xO2/HPiZZnMJu07+sxUErzjIe1EPP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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