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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b36deea60f9e534d33d757d79e2484d65d9f60d4ab91be37683744866e7d5264' 
  AND token = 'cR7SLS0HLILeCfKVLVYYvIIYAf9hq6gNv9gy6JjxBW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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