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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fab7e452d053656db2243f4f8f3b56721d4c2984ab049d65178907aa72328d1' 
  AND token = 'Prd99azfxlixrbKeYn3i/QBWMqESQa58stcK/5oWCJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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