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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6284bfbb06b6de4a304d5095739a50b112aa6b4539a3dd4d770f24284b2debd' 
  AND token = 'YtaVxeUIXJ/cqbX5dQcTB65Ev8R5dFid8wdYbQI6feE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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