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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09dbd3de47f1117c051621164727d3e32dac4e28c3d45aae246a8541df1e5ff3' 
  AND token = '371gjtNTgbydDxo4ng7FMvYuBJutCUkt4mhT6eMJHAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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