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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3058f27804af3367d44b7373054669f1be935e3530c510fb56f4db05d4429e6a' 
  AND token = '+wKp6mTcll56/qQt4V4drgC9mTOSsHcc7aCBmI3AOZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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