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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9abf3aa86c963101fc1f34d6f3ebb5de9febf5d255f88b743c554c39aeda5e34' 
  AND token = '9Q48uWdK0U/C0nF2kzjLm5TJzQ68d5vF50WywwJFge8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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