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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe5757a672cb4790d30e7eace68193ff5810aab5433161e73a229ba9724c271c' 
  AND token = 'WpOnAW6I6SjHIblMrg63wukz5XapbzV8w3+HHfVgJJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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