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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc17711985a8be8c2cf5bed836f4bb9a1860671136259ab92f7255769245cae9' 
  AND token = '54UyEukMlOUtvWoPu1e9HxUv5F8i+8/mbMGcnF5EmxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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