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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14c7834b326c567815f159f45c6c81b6d56ee4c03a1d13b3a860dff8fbf9188e' 
  AND token = 'yc4E+wp9DIZyAfhX3KiCAnOjeqq/vFfcpgeKRwKryqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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