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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67960e099c954830289403090aaafa70844eb468540c5f4ec15aa66f18a175c1' 
  AND token = 'cZ+l56SDlk94sPAvId0v7XwLHMmQ7ku9uXW/pkb5syU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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