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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cd6964eb6c25cf02ab6224c34530967690ac11c9ecfbd2fb180c26d5e6fe2bb' 
  AND token = 'UKr1Z48ubd4bje0UuszMXQu+eIHxQbfDS6kQSYuj3HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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