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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41819749009795de0ae4413b610b8943652347820ea2c9e703c42614834e5aa0' 
  AND token = '+t7aQCbgzjVuyiGC978E0MZYevlVi22blx7XTY/7xv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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