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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6e38355fc1c689861830edb9918e985213de3f8cad42ae844bec3f1e1417eae' 
  AND token = '8lZU3i0yfutEv1e/ooen0raES5KdgCtzWoT12xgilD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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