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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e806639540f358f3ef33e19fdedcd45f56947893e35a73ad168e2f73eddd8ad' 
  AND token = 'tSQCjC59DO3xj2Lab10mDuD2X5eqIcmdGJX7Fu4OWto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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