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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f7972279f3f0ca7ec52427dd07eeab64ae756e842fcb83b0cda8105a776e6a9' 
  AND token = 'xNz4wK+lXJsl1KQwrPlA3h1HSNBY0HgwhwyM8YAeA24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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