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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ef470bd130a790c3f72d2955f31920940cd4f111fdc908dadb2271b70920b53' 
  AND token = 'o0UGTbuV6sbWbfh7sJ9HAhyHdjxh1u5hw9qin0MkfQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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