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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddd268de6ed6af10386f95e9c6af49bc15ad111b19f22ef4544f93fa1fe4cfde' 
  AND token = '11Ljc+Q6TrUi5V9nCRTknIinI2uVZgXNxjG6oNPohq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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