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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6bb13ed3587e722ea3626b328ff2317b02aa60d06e18b335344b29c9211180a' 
  AND token = 'N67/ghu1bg+DjMnuw6uNYSjHl3pJLGAfSfC6xVyIA2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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