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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02b79abc53b1bf3727cc6f1c5b5c9745768b3ebf50b67acca497103db4dfc523' 
  AND token = '6W0BjXboxMluOHSkvxsRwXWESMYoJmsN5537rfC/KbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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