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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db405a155bb8d655e4152a41c7bfe9b6cd6bc0e5244f0949bc3dd3b2f3956d89' 
  AND token = 'M1SE1sghcQETLI4DRAJhl+EsNOd0XAQpyNZC0po/DhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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