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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3392cd5dc40082fbbab5b70dbd0cd4b9e86296fdb150cc42ba726dafc9e9e20' 
  AND token = '8OPKlNhRGiupkutUglN0p3S8rffDYa0vzKNc3T7JoDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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