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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f87d636dbb12f22b4d53664ac31dc364087b4274d9386d5df5dae35884131d5a' 
  AND token = '+OcAT1b5+/DZ50YeOtQxeZqqHrbJNWmWQzK8g5qP77s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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