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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c2f97bc9e6712f11dbef7fe2915b652129a8a94e393239fa559ee85cb565ddf' 
  AND token = 'GLY6tX+LpYrHP3YTkZhgukaZmWg6pn/nEarKFdQm6UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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