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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '046f0054657eb875c94361285b0f377573942bf75b7595078b2f294b901eb1dc' 
  AND token = '7Qp9LXp+DV0duPbcNuDTpg0uiRAN9FaHqBdHLmO8BKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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