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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a641443b91270f5d3715609ee92b787de661487d2a47378cf752d27a93198261' 
  AND token = 'Hk+9W+Mwt2VJd2xbV02ncmc4VXALNt9bUfgSdor9/mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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