SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fc432b6769135f2438c89ea80af6bd404dd4784e131f935cd44bd8acb24b426' 
  AND token = 'LsgTFt/KMhOfwXTvJC1ymIMe7GWE2rgTdmJBcVu/P18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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