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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6965a83d2adf8c1b2010e5eb56b237ba6d79c32494e9ca5f8d7cc85b7f1f558' 
  AND token = 'bLP3UU9uARJP3lv3FpxIiX9iLc1KSbP4BCS1OswgnBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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