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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e11a5d3ee157e3472f06261a3f16106ab203771aae8f8e24d197be98e6902b3' 
  AND token = 'PVWfzNh5FswBArFX6d8VVpvuKbfLpIalvO1/7MiC2uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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