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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '990b7042ec6f2174437c80fe421e8d1a0e9e49e83ae28220dd4631e784e6cd0c' 
  AND token = 'V8gucD0KcrbOEvUOmkAMIyjUqUJFiziMwpPjXbOArSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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