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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa73b00099034439380d8ce9ae86d16d2dcbf45fe51088a548ff892ad946993a' 
  AND token = 'PWiYLGCrEflYBurV78rcNfwKrhy9T6NYgSS/v7q7gr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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