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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '454c2bf5de19381e025963e9727b4ad824204a6a0335713d36d9fdb4355c9d1b' 
  AND token = 'BKw35U8wKKU/MkOu3lXx+OWMBefeUhyrGPeDkuT3ojU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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