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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7e361a9992b8257187335a44a751ebe26d8c7eb8f4fa82ee2d0e698948d8ecf' 
  AND token = 'dCE6DD9VriXep+4rbxsCRq1UW0Pf81IqC/J1+AIR2fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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