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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5b5c471d20e9d9a1f91f0225b74cd5f36c2f4654c73be43eb39b8969b0c04c8' 
  AND token = '5OdIwUZbBz4nyuw8/7iEfavlk/hKdiPKyA5R1DW6UlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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