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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c6190e6a8cfa0f0613372f9d2b4a62d7e7cd7f9b3072e9cf12a0926ff605439' 
  AND token = 'z5moS4mzNKaQe/YmKH7ueIwgcWfLYgbiiWlbmnbi/iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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