SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e181f2d1d0433b1daede73191dc07bf1686e20daed2cc95bd3dfa3ac07c9e65' 
  AND token = 'iVqvP5jobMqgbmQf+hN+STXWKiSOhwEzSuRU2yEIzVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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