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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd518601444074a74a36ac5d3680b85bcd8832f8d20a774d7328b42c506723bd4' 
  AND token = 'WBHtYKpjQY26LbEjcRC0fzWQGfpO0lXVK5Tw1bkatCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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