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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '926cc93bcffa363d9cf91d7f349ee1b41cabf197e6b13017acd2b45cb63707c8' 
  AND token = 'KADW/7c6jHSQjWH478jKT3eipGYiEtmoyeqay8y6Z3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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