SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edbf3e7985dc8c68ac03fbf6ee875230d7986de87943ed279a4b52104761d5bd' 
  AND token = 'dp9O8+R9U3a0qJzXavNOwGiiCXrQp0BYxH/Klnslibs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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