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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3088544af7ec61a714e550f44e7419626cde5fcf28237e71bbfef424fe4e33bd' 
  AND token = 'FWR7uboDfI4RJfNQSvxypcTY6hdiO+PAN7CXjHvIJoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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