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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '995275eb9e247c2603105278760e7516895151461814b045f7d39075a58343a5' 
  AND token = 'rw0Ax/45y1+Q+MONSXFnjEQdpedBJd2tAf3EMaEpui4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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