SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56c7dc15976fde5b7fd20b56fb651aa53306cf131c5ace1d3398f1d30128574f' 
  AND token = 'FqAqYYXTMDk3JCGxw7zpOq/nJvZxtpVXi/gwGGV+uhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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