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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5917819b91d3e6d2b5bb7485d9359d07685b427043f7727094dd7b32e798ac7' 
  AND token = '0Tq5my4iYVe1wQEUvGvq7hIZOYsML3Ub3kSso4MHfYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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