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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b1a81f935eabc802af172fb6945a1f68450352fe6eb882a4d222b5fc8a21f87' 
  AND token = 'HLMs8fcDIUD/eFLhxEpvb/ggCvl5g6Oo2qBjSO5Wm4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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